cli: only warn when bump fails + fix forbidden duplicate filter

[Rugvip]

Hey, I just made a Pull Request!

🧹, version bump failure now logs something like this instead, and doesn't exit with a non-zero code:

The packages there are just debugging examples, can't actually happen 😅

:heavy_check_mark: Checklist

• [x] A changeset describing the change and affected packages. (more info)
• [ ] Added or updated documentation
• [x] Tests for new functionality and regression tests for bug fixes
• [ ] Screenshots attached (for UI changes)
• [x] All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie[bot]]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage/cli	packages/cli	patch	v0.26.5-next.0

[github-actions[bot]]

Uffizzi Cluster pr-24594 was deleted.

[benjdlambert]

🚢

[github-actions[bot]]

Thank you for contributing to Backstage! The changes in this pull request will be part of the 1.27.0 release, scheduled for Tue, 14 May 2024.